Handle for percussive tools



Sept. 20, 1932. E. B. LEAR 1,877,771

HANDLE FOR PERCUSSIVE TOOLS Filed Oct. 16. 1929 7 I INVENTOR. fl t 5 Mi; E' aLBliewv. BY Z:

E27 I H15. ATTORNEY.

Patented Sept. 20, 1932 UNITED STATES PATENT orries EARL B. LEAR, OF PI-IILLIPSBURG, NEW JERSEY, ASSIGNOR T INGERSOLL-RAND COM-- 7 PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY HANDLE FOR PERCUSSIVE TOOLS Application filed. October 16, "1929. Serial No. 399,989. 7

This invention relates to percussive tools, but more particularly to a handle for percussive tools of the hand held type.

One object of the invention is to enable the percussive tool to be readily equipped with a handle comprising the usual pair of grip portions for down hole drilling or to equip the tool with a single grip member adapted to lie in the same longitudinal plane as the tool and against which pressure may be applied for drilling in horizontal positions.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing illustrating one form which the invention may assume in practice and a practical application thereof,

Figure 1 is an elevation partly in section of a handle showing it applied to a percussive tool,

Figure 2 is a side elevation of the handle, and Figure 3 is a view similar to Figure 1 showing a different type of handle structure for the tool.

Referring more particularly to the drawing, the handle designated by A is shown ap plied to a percussive tool only a portion of the cylinder B of which is shown. On the rearward end of the cylinder is a back head. C which may be secured to the cylinder 13 in any suitable manner, as for instance, by side bolts D.

The back head C may be of a well known type having an offset portion or lug E on one side thereof and an aperture F in the lug for the reception of a handle bolt, such as that designated by "G, and which bolt, when inserted in the aperture F, extends on opposite sides thereof to support on its ends grip members H whereby the tool may be manipulated and held to the work.

Tools provided with a handle element in which the grip portions lie on opposite sides of the casing are more particularly adapted for vertical or down hole drilling and in which position the tool may be readily guided and applied to the work by pressing against the grip members. Tools of this type, being of light weight are, by reason of this fact, also capable of being used for horizontal drilling or for drilling holes inclined with respect to the horizontal. lVhen used in the latter position the tool may not be conveniently guided and supported entirely from therearward extremity thereof. lhe customary procedure is to grasp the tool at an intermediate point, as for instance, by its cylinder with one hand, and to apply the pressure necessary for obtaining best drilling results against the rearward end of the tool with the other hand. i y

In the case where a plurality of grip portions areprovided and where such grip portions extend from the sides of the tool it is extremely difficult to properly guide the tool with respect to the working implement. Thus operated, when pressure is applied to only one grip member the percussive tool is readily drawn out of alignment with respect to the working implement. In consequence, the working implement is not only caused to bind in the drill hole during the drilling operation but is likely to deflect from the original course so that it will be extremely diflicult to remove the working implement from the drill hole. Aside from the objectionable features enumerated, any relative deflection between the working implement and the percussive tool will also tend to cause excessive wear on that portion of the tool which serves as a chuck for the working implement.

The handle A, constructed in accordance with the practice of the invention, comprises a grip portion J adapted to lie rearwardly of the back head and is preferably of a length equal to that of the lug E. The grip portion J has a pair of legs or lateral extensions K which are curved outwardly and are spaced near their free ends to a distance substantially equal to the length of the lug E, against the sides L of which they are adapted to seat. On the free ends of the extensions K are introverted hooks O which extend beneath the lug E and seat against surfaces P thereof to assure against relative rotary movement between the handle A and the back head O.

In the legs or extensions K are apertures Q which register with the aperture F and in the apertures Q, and F is inserted a bolt R having a nut S threaded thereon to clamp the extensions K securely against the sides of the lug E.

By providing the grip portion J of the handle A with an aperture T to accommodate the bolt G, the grip members I-Imay be placed adjacent the grip portion instead of removing the grip portion and arranging the bolt and the grip members as in Figure 8.

In practice, whenever it is desired to use the percussive tool for down hole drilling the bolt G may be placed in the lug E. With.

the grip members II on thevbolt'G the tool may then be manipulated solely by means of the said grip members H. When drilling in horizontal positions wherein the Weight of the tool is supported by the operator the grip members H may be removed from the back head and the handle A may then be substituted therefore and secured to the back head by means of the bolt I claim:

1 In a percussive tool the combination of a back head and a lug on the back head having an aperture therein, a handle, extensions on the handle seating against the ends 01E the lug, a bolt 1n the aperture and the extensions ior securing'th'e handle to the lug,

and hooks on the extensions engaging the lug to prevent rotation of the handle with respect to the back head.

'2. In a percussive tool, the combination of a back head and a lug on the back head having an aperture therein, a handle, extensions on the handle seating against the ends of the lug, a bolt in the aperture and the extensions for securing the handle to the lug, hooks on the extensions engaging the lug to prevent rotation of the handle with respect to the back head, and an aperture in the handle for the reception of an auxiliary handle.

' In testimony whereof I have signed this specification.

- EARL LEAR. I 

